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feeder_gateway.go
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feeder_gateway.go
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package synchronizer
import (
"bytes"
"context"
"encoding/gob"
"fmt"
"strconv"
"time"
"github.com/carbonable-labs/indexer/internal/starknet"
"github.com/carbonable-labs/indexer/internal/storage"
"github.com/charmbracelet/log"
)
type FeederGateway struct {
storage storage.Storage
client *starknet.FeederGatewayClient
msgch chan *starknet.GetBlockResponse
}
func NewFeederGatewaySynchronizer(client *starknet.FeederGatewayClient, storage storage.Storage) *FeederGateway {
return &FeederGateway{
client: client,
storage: storage,
msgch: make(chan *starknet.GetBlockResponse),
}
}
func (g *FeederGateway) Start(ctx context.Context) {
log.Info("Start", "datasource", "feeder_gateway")
s := NewSynchronizer(g.client, g.storage)
s.Start(ctx)
}
func (g *FeederGateway) SyncBlock(ctx context.Context, block uint64) error {
log.Info("Sync", "block", block)
return nil
}
type Synchronizer struct {
storage storage.Storage
client *starknet.FeederGatewayClient
msgch chan *starknet.GetBlockResponse
}
func (s *Synchronizer) Start(ctx context.Context) {
go s.start(ctx)
for {
msg := <-s.msgch
s.SyncBlock(ctx, msg)
}
}
func (s *Synchronizer) start(ctx context.Context) {
block := uint64(1)
lastBlock, _ := s.getLatestBlock()
if lastBlock > block {
block = lastBlock
}
for {
resp, err := s.FetchBlock(block)
if err != nil {
// error will often be some timeout
log.Error(err)
time.Sleep(5 * time.Second)
continue
}
s.msgch <- resp
block++
}
}
func (s *Synchronizer) SyncBlock(ctx context.Context, block *starknet.GetBlockResponse) {
log.Info("Sync", "block", block.BlockNumber)
go s.storeBlock(block)
// store data by configuration
go s.storeLatestBlock(block.BlockNumber)
}
func (s *Synchronizer) storeBlock(block *starknet.GetBlockResponse) {
var buf bytes.Buffer
encoder := gob.NewEncoder(&buf)
if err := encoder.Encode(block); err != nil {
log.Error(fmt.Sprintf("failed to encode block %s", err))
}
if err := s.storage.Set([]byte(fmt.Sprintf("block.%d", block.BlockNumber)), buf.Bytes()); err != nil {
log.Error(err)
}
}
func (s *Synchronizer) FetchBlock(blockNumber uint64) (*starknet.GetBlockResponse, error) {
key := []byte(fmt.Sprintf("block.%d", blockNumber))
if s.storage.Has(key) {
block := s.storage.Get(key)
buf := bytes.NewBuffer(block)
decoder := gob.NewDecoder(buf)
var resp starknet.GetBlockResponse
err := decoder.Decode(&resp)
if err != nil {
log.Error(fmt.Sprintf("failed to decode block %s", err))
return &resp, err
}
return &resp, nil
}
return s.client.GetBlock(blockNumber)
}
func (s *Synchronizer) storeLatestBlock(blockNumber uint64) {
lastBlock, err := s.getLatestBlock()
if err != nil {
log.Error(err)
}
if lastBlock >= blockNumber {
return
}
var buf bytes.Buffer
encoder := gob.NewEncoder(&buf)
if err := encoder.Encode(fmt.Sprintf("%d", blockNumber)); err != nil {
log.Error(fmt.Sprintf("failed to encode block %s", err))
}
if err := s.storage.Set([]byte("latest_block"), buf.Bytes()); err != nil {
log.Error(err)
}
}
func (s *Synchronizer) getLatestBlock() (uint64, error) {
res := s.storage.Get([]byte("latest_block"))
buf := bytes.NewBuffer(res)
decoder := gob.NewDecoder(buf)
var bn string
err := decoder.Decode(&bn)
if err != nil {
return 0, fmt.Errorf("failed to decode block %s", err)
}
num, err := strconv.ParseUint(bn, 10, 64)
if err != nil {
return 0, fmt.Errorf("failed to parse block %s", err)
}
return num, nil
}
func NewSynchronizer(client *starknet.FeederGatewayClient, storage storage.Storage) *Synchronizer {
return &Synchronizer{
client: client,
storage: storage,
msgch: make(chan *starknet.GetBlockResponse),
}
}